Summary

Dr. Demanes received his bachelor of arts degree from UC Berkeley and his medical degree from the David Geffen School of Medicine at UCLA. He completed residencies in internal medicine and radiation oncology at UCLA and his medical oncology fellowship at UCSF. He is the past chairman and president of the American College of Radiation Oncology.

Dr. Demanes specializes in brachytherapy, the surgical subspecialty of radiation oncology. He founded the California Endocurietherapy Center (CET) in 1981 and has performed more than 10,000 surgical radiation implants.

Dr. Demanes pioneered the use of high-dose-rate brachytherapy in prostate, head and neck, breast, GI, and gynecologic cancer. His research explores the novel use of brachytherapy in the treatment of cancer.

Quick Facts

  • 5
  • 52 years of experience
  • speaks English, Spanish
  • Kaiser Permanente Medical Center
  • 1 written review
  • 3 specialties
  • 23 areas of expertise
  • 3 board certifications
  • 3 hospital affiliations
  • 3 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. David Jeffrey Demanes has 3 locations

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Dr. David Jeffrey Demanes, MD
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Dr. David Jeffrey Demanes, MDStephen Banks, MDAndrew Martella, MDDavid Tate, MD
Radiation OncologyRadiation OncologyRadiation OncologyRadiation Oncology
Accepts New Patients Accepts New Patients Accepts New Patients
52 Years of Experience 33 Years of Experience 12 Years of Experience 39 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English, Spanish Speaks English, Spanish
Walnut Creek , CAVacaville , CACastro Valley , CAVacaville , CA
Med School: David Geffen School Of Medicine At Ucla Med School: Stanford University School Of Medicine Med School: Duke University School Of Medicine Med School: University Of Virginia School Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. David Jeffrey Demanes

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. David Jeffrey Demanes has the following 3 specialties

Specialty Expertise

Dr. David Jeffrey Demanes has the following 23 areas of expertise

  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Cancer
  • Cancerous Tumor
  • Chemotherapy
  • Colon Cancer
  • Colon Tumor (Adenomatous Polyps)
  • Colorectal Cancer
  • Diverticulitis
  • Galbladder Removal (Cholecystectomy)
  • Gastrointestinal Surgery
  • Head and Neck Cancer
  • Hiatal Hernia
  • Internal Medicine
  • Lung Cancer
  • Melanoma
  • Metastasis
  • Metastatic Breast Cancer
  • Oncology
  • Pancreatic Cancer
  • Prostate Cancer (Prostatic Neoplasm)
  • Rectal Cancer
  • Stomach Cancer
  • Thyroid Cancer

Certifications, License, & Education

52 Years Experience

Dr. David Jeffrey Demanes holds an expired medical license in the state of California.

Medical License

Medical Doctor with an expired medical license in the state of California that expired in 2026.

Education & Training

Residency

Completed their residency at Kaiser Permanente Medical Center.

Medical School

Graduated from David Geffen School Of Medicine At Ucla in 1974.

NPI Number

Dr. Demanes' NPI number is 1407914757.

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Frequently Asked Questions

How can I make an appointment with Dr. David Demanes?
You can find contact information for Dr. David Demanes here on Vitals.
Does Dr. David Demanes accept virtual/telehealth appointments?
Dr. David Demanes has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Where is Dr. David Demanes's office located?
Dr. David Demanes's office is located at 1601 Ygnacio Valley Rd, Walnut Creek, CA, 94598.
Which hospitals is Dr. David Demanes affiliated with?
Dr. David Demanes is affiliated with John Muir Health Concord Medical Center, Walnut Creek Medical Center, and Alta Bates Summit Medical Center Summit Campus.
What languages does Dr. David Demanes speak?
Dr. David Demanes speaks English and Spanish.

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